Derived from the plant named Senna. The name is a variant of the Arabic name Sana, which means "brilliance, radiance, splendour."In literature, this is the name of a female antagonist and witch from K.A. Applegate's series Everworld as well as a character in Stephenie Meyer's Twilight saga.
From Japanese 茜 (sen) meaning "deep red, dye from the rubia plant", 仙 (sen) meaning "immortal, transcendent, celestial being, fairy", 千 (sen) meaning "thousand" or 扇 (sen) meaning "fan (folding fan)" combined with 菜 (na) meaning "vegetables, greens" or 奈 (na) meaning "apple tree". Other kanji combinations are possible.A famous female bearer is Senna Matsuda, a Japanese model and actress